UniShare is a Windows Phone app that has been available on the platform for some time. It enables users to share content with the wider world through connected social networks. More specifically, you can share to multiple networks at the same time with just one-click and it replaces the Me Tile feature from years ago. The developer has worked some magic to turn the app into a Universal Windows Platform offering.
Unfortunately, should you be upgrading from said old version of UniShare, you may come across a few features that may be missing or aren't currently available. It has been confirmed on the Store listing that these omissions are being addressed and functionality should hopefully be restored in coming updates.
Thanks Thallanor for the heads up!